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F . The Contractor shall assist the County with the preparation of the public-education <br /> materials , the design and operation of nature trails , and/or boardwalks through the wetland <br /> system on an as- needed basis . <br /> III . MAINTENANCE RESPONSIBILITIES <br /> The maintenance responsibilities for the wetland system shall be as follows : <br /> A . Maintain the distribution of exotic and nuisance species including , but not limited to <br /> Typha spp, Ludwigia peruviana at or below one percent of the total cover of all <br /> macrohphytic species in the wetland system . <br /> B . Continue the re-vegetation of open water areas of cells . <br /> C . Maintain the weir structures in each cell — to include the removal of sand and other <br /> debris from the pipes connecting the cells , the clearing of vegetation within a ten -foot <br /> radius of the weir, re-vegetation of erosion points adjacent to the weirs , and replacement of <br /> weir boards . <br /> D . Assist the County with the design of possible wetland improvements , including , but not <br /> limited to , information stations , boardwalks , observation decks , and landscaping . <br /> 3 <br />